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Elis [28]
2 years ago
15

55.845 nearest tenth

Chemistry
2 answers:
Oksanka [162]2 years ago
8 0

Answer:

55.8

Explanation:

saveliy_v [14]2 years ago
6 0

Answer: 55.8

Explanation:

there is more possible answers

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Three forms of radiation are also called ionizing radiation
Trava [24]

Answer:

Alpha Particle, Beta Particles and Gamma Rays

Explanation:

8 0
2 years ago
Which symbol represents a particle with a total of 10 electrons
vova2212 [387]
Al3+ is the answer. :)
7 0
3 years ago
Calculate how much heat is absorbed by a sample that weighs 12 kilograms, has a specific heat of 0.231 kg/CJ, and is heated from
Andrei [34K]

Answer:

97 J

Explanation:

Step 1: Given data

  • Mass of the sample (m): 12 kg
  • Specific heat capacity (c): 0.231 J/kg.°C (this can also be expressed as 0.231 J/kg.K)
  • Initial temperature: 45 K
  • Final temperature: 80 K

Step 2: Calculate the temperature change

ΔT = 80 K - 45 K = 35 K

Step 3: Calculate the heat required (Q)

We will use the following expression.

Q = c × m × ΔT

Q = 0.231 J/kg.K × 12 kg × 35 K = 97 J

4 0
2 years ago
The number of significant figures in 0.000820 g is?
lubasha [3.4K]
There are 3 sig figs.  8 and 2 are obvious.  The ending 0 is significant because it is at the end of a decimal number, and doesn't have to be measured.
7 0
3 years ago
How many moles of silane gas (SiH4) are present in 8.68 mL<br> measured at 18 0C and 1.50 atm?
makvit [3.9K]

Answer:

5.45*10⁻⁴ moles of silane gas (SiH₄) are present in 8.68 mL  measured at 18°C and 1.50 atm.

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P * V = n * R * T

In this case:

  • P= 1.5 atm
  • V= 8.68 mL= 0.00868 L (being 1000 mL= 1 L)
  • n= ?
  • R= 0.082 \frac{atm*L}{mol*K}
  • T= 18 C= 291 K (being 0 C= 273 K)

Replacing:

1.5 atm* 0.00868 L= n* 0.082\frac{atm*L}{mol*K} *291 K

Solving:

n=\frac{1.5 atm*0.00868 L}{0.082 \frac{atm*L}{mol*K}*291 K}

n= 5.45*10⁻⁴ moles

<u><em>5.45*10⁻⁴ moles of silane gas (SiH₄) are present in 8.68 mL  measured at 18°C and 1.50 atm.</em></u>

8 0
2 years ago
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